Men are powerful, women are weak

If we are talking about physical power, this statement is true. I think this is why men have been considered to be the "superior gender" for the last 10.000 years. After the neolithic revolution (after mankind established villages and city-states) most of the cultures became patriarchal. This is because men were better farmers and warriors. Physical power was very important in these times. But now, in the modern world, things have changed: physical power is worthless. Machines do the hard work in the farms and we make wars with guns; it doesn't matter who pushes the trigger, a man, a woman or even a child. But cultures change slowly over centuries. In my opinion, old cultures are the reasons of the inequalities between man and woman.